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anonymous

  • one year ago

Can someone help me on a few questions?

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  1. Baby_Bear69
    • one year ago
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    I can try. What are they?

  2. anonymous
    • one year ago
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    there is two questions that say evaluate. I have to upload the image though

  3. anonymous
    • one year ago
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  4. Baby_Bear69
    • one year ago
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    oh lawd, I seen this in my textbook this year but I haven't learnt it yet, sorry :/

  5. anonymous
    • one year ago
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    oh okay well thanks for looking at it :/

  6. Nnesha
    • one year ago
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    what is the question ? like what we have to do with that ?

  7. anonymous
    • one year ago
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    I have no clue on how to do the question. It just say evaluate then the image i posted.

  8. Nnesha
    • one year ago
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    |dw:1439566610288:dw|

  9. Nnesha
    • one year ago
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    |dw:1439566827777:dw| there are total 7 term start from 1 a number which is raising to the power is ration

  10. Nnesha
    • one year ago
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    so replace n by 2 to find 2nd term 3 to find 3rd term untill 7

  11. Nnesha
    • one year ago
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    |dw:1439566934306:dw|

  12. Nnesha
    • one year ago
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    we just need that circle part n= terms that you have to find starting from 1 to 7 here i plugin 2 to find 2nd term \[\huge\rm 2(-2)^{\color{red}{2}-1}\] like this now solve

  13. anonymous
    • one year ago
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    would it be -4?

  14. Nnesha
    • one year ago
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    yes right !

  15. anonymous
    • one year ago
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    so i just keep plugging number in till i get to 7? Or could i just skip to 7?

  16. Nnesha
    • one year ago
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    wait a sec let me solve it first been a year haven't done question like this :/

  17. Nnesha
    • one year ago
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    you have to find all terms then add them.

  18. Nnesha
    • one year ago
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    we have to evaluate if it say find sum then we can use the formula.

  19. dinamix
    • one year ago
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    Nnesha its not function like power series right ?

  20. Nnesha
    • one year ago
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    wait doesn't matter you will get the same answer no need to find all terms

  21. dinamix
    • one year ago
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    its just total numbers i think

  22. Nnesha
    • one year ago
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    \[\huge\rm S_n = \frac{ a_1(1-r^n )}{ 1-r }\] use this formula plug in the r and n values then sovle

  23. Nnesha
    • one year ago
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    a_1= first term r= ratio n= number of total terms!

  24. Nnesha
    • one year ago
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    yeah sum of all 7 terms but we can use that formula to find sum of 7 terms that way we don't have to find 3,4,5,6,7 terms

  25. anonymous
    • one year ago
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    so i could do it either way and get the same answer?

  26. Nnesha
    • one year ago
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    yes right

  27. anonymous
    • one year ago
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    okay thank you!!

  28. Nnesha
    • one year ago
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    my pleasure!

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